Republican Sen. John Ensign of Nevada, a leading conservative mentioned as a potential presidential candidate, admitted Tuesday he had an extramarital affair with a woman who was a member of his campaign staff. “Last year I had an affair. I violated the vows of my marriage,” Ensign said at a brief news conference. “It is the worst thing I have ever done in my life. If there was ever anything in my life that I could take back, this would be it.”

Ensign spokesman Tory Mazzola said the affair took place between December 2007 and August 2008 with a campaign staffer who was married to an employee in Ensign’s Senate office. Neither has worked for the senator since May 2008.

Ensign, 51, said he would not mention the name of the campaign aide involved in the affair. He described the woman and her husband as good friends.

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